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<title>class Logger::LogDevice - logger: Ruby Standard Library Documentation</title>


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    <li><a class="include" href="Period.html">Logger::Period</a>
    <li><span class="include">MonitorMixin</span>
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-add_log_header">#add_log_header</a>
    <li ><a href="#method-i-check_shift_log">#check_shift_log</a>
    <li ><a href="#method-i-close">#close</a>
    <li ><a href="#method-i-create_logfile">#create_logfile</a>
    <li ><a href="#method-i-lock_shift_log">#lock_shift_log</a>
    <li ><a href="#method-i-open_logfile">#open_logfile</a>
    <li ><a href="#method-i-reopen">#reopen</a>
    <li ><a href="#method-i-set_dev">#set_dev</a>
    <li ><a href="#method-i-shift_log_age">#shift_log_age</a>
    <li ><a href="#method-i-shift_log_period">#shift_log_period</a>
    <li ><a href="#method-i-write">#write</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-Logger::LogDevice">
    <h1 id="class-Logger::LogDevice" class="class">
      class Logger::LogDevice
    </h1>

    <section class="description">
    
<p>Device used for logging messages.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">



        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-dev" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">dev</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-filename" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">filename</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(log = nil, shift_age: nil, shift_size: nil, shift_period_suffix: nil, binmode: false)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 14</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">log</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-value">shift_age:</span> <span class="ruby-keyword">nil</span>, <span class="ruby-value">shift_size:</span> <span class="ruby-keyword">nil</span>, <span class="ruby-value">shift_period_suffix:</span> <span class="ruby-keyword">nil</span>, <span class="ruby-value">binmode:</span> <span class="ruby-keyword">false</span>)
  <span class="ruby-ivar">@dev</span> = <span class="ruby-ivar">@filename</span> = <span class="ruby-ivar">@shift_age</span> = <span class="ruby-ivar">@shift_size</span> = <span class="ruby-ivar">@shift_period_suffix</span> = <span class="ruby-keyword">nil</span>
  <span class="ruby-ivar">@binmode</span> = <span class="ruby-identifier">binmode</span>
  <span class="ruby-identifier">mon_initialize</span>
  <span class="ruby-identifier">set_dev</span>(<span class="ruby-identifier">log</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@filename</span>
    <span class="ruby-ivar">@shift_age</span> = <span class="ruby-identifier">shift_age</span> <span class="ruby-operator">||</span> <span class="ruby-value">7</span>
    <span class="ruby-ivar">@shift_size</span> = <span class="ruby-identifier">shift_size</span> <span class="ruby-operator">||</span> <span class="ruby-value">1048576</span>
    <span class="ruby-ivar">@shift_period_suffix</span> = <span class="ruby-identifier">shift_period_suffix</span> <span class="ruby-operator">||</span> <span class="ruby-string">&#39;%Y%m%d&#39;</span>

    <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@shift_age</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Integer</span>)
      <span class="ruby-identifier">base_time</span> = <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:stat</span>) <span class="ruby-operator">?</span> <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">stat</span>.<span class="ruby-identifier">mtime</span> <span class="ruby-operator">:</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>
      <span class="ruby-ivar">@next_rotate_time</span> = <span class="ruby-identifier">next_rotate_time</span>(<span class="ruby-identifier">base_time</span>, <span class="ruby-ivar">@shift_age</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-close" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">close</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="close-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 52</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">close</span>
  <span class="ruby-keyword">begin</span>
    <span class="ruby-identifier">synchronize</span> <span class="ruby-keyword">do</span>
      <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span>
    <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-reopen" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">reopen</span><span
                                class="method-args">(log = nil)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="reopen-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 62</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">reopen</span>(<span class="ruby-identifier">log</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-comment"># reopen the same filename if no argument, do nothing for IO</span>
  <span class="ruby-identifier">log</span> <span class="ruby-operator">||=</span> <span class="ruby-ivar">@filename</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@filename</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">log</span>
    <span class="ruby-identifier">synchronize</span> <span class="ruby-keyword">do</span>
      <span class="ruby-keyword">if</span> <span class="ruby-ivar">@filename</span> <span class="ruby-keyword">and</span> <span class="ruby-ivar">@dev</span>
        <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span> <span class="ruby-comment"># close only file opened by Logger</span>
        <span class="ruby-ivar">@filename</span> = <span class="ruby-keyword">nil</span>
      <span class="ruby-keyword">end</span>
      <span class="ruby-identifier">set_dev</span>(<span class="ruby-identifier">log</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">self</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write</span><span
                                class="method-args">(message)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="write-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 31</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write</span>(<span class="ruby-identifier">message</span>)
  <span class="ruby-keyword">begin</span>
    <span class="ruby-identifier">synchronize</span> <span class="ruby-keyword">do</span>
      <span class="ruby-keyword">if</span> <span class="ruby-ivar">@shift_age</span> <span class="ruby-keyword">and</span> <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:stat</span>)
        <span class="ruby-keyword">begin</span>
          <span class="ruby-identifier">check_shift_log</span>
        <span class="ruby-keyword">rescue</span>
          <span class="ruby-identifier">warn</span>(<span class="ruby-node">&quot;log shifting failed. #{$!}&quot;</span>)
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">begin</span>
        <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">write</span>(<span class="ruby-identifier">message</span>)
      <span class="ruby-keyword">rescue</span>
        <span class="ruby-identifier">warn</span>(<span class="ruby-node">&quot;log writing failed. #{$!}&quot;</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">ignored</span>
    <span class="ruby-identifier">warn</span>(<span class="ruby-node">&quot;log writing failed. #{ignored}&quot;</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-add_log_header" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">add_log_header</span><span
                                class="method-args">(file)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="add_log_header-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 119</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">add_log_header</span>(<span class="ruby-identifier">file</span>)
  <span class="ruby-identifier">file</span>.<span class="ruby-identifier">write</span>(
    <span class="ruby-string">&quot;# Logfile created on %s by %s\n&quot;</span> <span class="ruby-operator">%</span> [<span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_s</span>, <span class="ruby-constant">Logger</span><span class="ruby-operator">::</span><span class="ruby-constant">ProgName</span>]
  ) <span class="ruby-keyword">if</span> <span class="ruby-identifier">file</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-check_shift_log" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">check_shift_log</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="check_shift_log-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 125</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">check_shift_log</span>
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@shift_age</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Integer</span>)
    <span class="ruby-comment"># Note: always returns false if &#39;0&#39;.</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@filename</span> <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-ivar">@shift_age</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span>) <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">stat</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;</span> <span class="ruby-ivar">@shift_size</span>)
      <span class="ruby-identifier">lock_shift_log</span> { <span class="ruby-identifier">shift_log_age</span> }
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">now</span> = <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">now</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-ivar">@next_rotate_time</span>
      <span class="ruby-ivar">@next_rotate_time</span> = <span class="ruby-identifier">next_rotate_time</span>(<span class="ruby-identifier">now</span>, <span class="ruby-ivar">@shift_age</span>)
      <span class="ruby-identifier">lock_shift_log</span> { <span class="ruby-identifier">shift_log_period</span>(<span class="ruby-identifier">previous_period_end</span>(<span class="ruby-identifier">now</span>, <span class="ruby-ivar">@shift_age</span>)) }
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-create_logfile" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">create_logfile</span><span
                                class="method-args">(filename)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="create_logfile-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 103</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">create_logfile</span>(<span class="ruby-identifier">filename</span>)
  <span class="ruby-keyword">begin</span>
    <span class="ruby-identifier">logdev</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">open</span>(<span class="ruby-identifier">filename</span>, (<span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">WRONLY</span> <span class="ruby-operator">|</span> <span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">APPEND</span> <span class="ruby-operator">|</span> <span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">CREAT</span> <span class="ruby-operator">|</span> <span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">EXCL</span>))
    <span class="ruby-identifier">logdev</span>.<span class="ruby-identifier">flock</span>(<span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">LOCK_EX</span>)
    <span class="ruby-identifier">logdev</span>.<span class="ruby-identifier">sync</span> = <span class="ruby-keyword">true</span>
    <span class="ruby-identifier">logdev</span>.<span class="ruby-identifier">binmode</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@binmode</span>
    <span class="ruby-identifier">add_log_header</span>(<span class="ruby-identifier">logdev</span>)
    <span class="ruby-identifier">logdev</span>.<span class="ruby-identifier">flock</span>(<span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">LOCK_UN</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Errno</span><span class="ruby-operator">::</span><span class="ruby-constant">EEXIST</span>
    <span class="ruby-comment"># file is created by another process</span>
    <span class="ruby-identifier">logdev</span> = <span class="ruby-identifier">open_logfile</span>(<span class="ruby-identifier">filename</span>)
    <span class="ruby-identifier">logdev</span>.<span class="ruby-identifier">sync</span> = <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">logdev</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-lock_shift_log" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">lock_shift_log</span><span
                                class="method-args">() { || ... }</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="lock_shift_log-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 141</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">lock_shift_log</span>
  <span class="ruby-keyword">yield</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-open_logfile" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">open_logfile</span><span
                                class="method-args">(filename)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="open_logfile-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 95</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">open_logfile</span>(<span class="ruby-identifier">filename</span>)
  <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">File</span>.<span class="ruby-identifier">open</span>(<span class="ruby-identifier">filename</span>, (<span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">WRONLY</span> <span class="ruby-operator">|</span> <span class="ruby-constant">File</span><span class="ruby-operator">::</span><span class="ruby-constant">APPEND</span>))
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Errno</span><span class="ruby-operator">::</span><span class="ruby-constant">ENOENT</span>
    <span class="ruby-identifier">create_logfile</span>(<span class="ruby-identifier">filename</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-set_dev" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">set_dev</span><span
                                class="method-args">(log)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="set_dev-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 79</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">set_dev</span>(<span class="ruby-identifier">log</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:write</span>) <span class="ruby-keyword">and</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:close</span>)
    <span class="ruby-ivar">@dev</span> = <span class="ruby-identifier">log</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:path</span>) <span class="ruby-keyword">and</span> <span class="ruby-identifier">path</span> = <span class="ruby-identifier">log</span>.<span class="ruby-identifier">path</span>
      <span class="ruby-keyword">if</span> <span class="ruby-constant">File</span>.<span class="ruby-identifier">exist?</span>(<span class="ruby-identifier">path</span>)
        <span class="ruby-ivar">@filename</span> = <span class="ruby-identifier">path</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-ivar">@dev</span> = <span class="ruby-identifier">open_logfile</span>(<span class="ruby-identifier">log</span>)
    <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">sync</span> = <span class="ruby-keyword">true</span>
    <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">binmode</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@binmode</span>
    <span class="ruby-ivar">@filename</span> = <span class="ruby-identifier">log</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-shift_log_age" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">shift_log_age</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="shift_log_age-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 176</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">shift_log_age</span>
  (<span class="ruby-ivar">@shift_age</span><span class="ruby-value">-3</span>).<span class="ruby-identifier">downto</span>(<span class="ruby-value">0</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">if</span> <span class="ruby-constant">FileTest</span>.<span class="ruby-identifier">exist?</span>(<span class="ruby-node">&quot;#{@filename}.#{i}&quot;</span>)
      <span class="ruby-constant">File</span>.<span class="ruby-identifier">rename</span>(<span class="ruby-node">&quot;#{@filename}.#{i}&quot;</span>, <span class="ruby-node">&quot;#{@filename}.#{i+1}&quot;</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-constant">File</span>.<span class="ruby-identifier">rename</span>(<span class="ruby-node">&quot;#{@filename}&quot;</span>, <span class="ruby-node">&quot;#{@filename}.0&quot;</span>)
  <span class="ruby-ivar">@dev</span> = <span class="ruby-identifier">create_logfile</span>(<span class="ruby-ivar">@filename</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">true</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-shift_log_period" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">shift_log_period</span><span
                                class="method-args">(period_end)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="shift_log_period-source">
            <pre><span class="ruby-comment"># File logger/log_device.rb, line 188</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">shift_log_period</span>(<span class="ruby-identifier">period_end</span>)
  <span class="ruby-identifier">suffix</span> = <span class="ruby-identifier">period_end</span>.<span class="ruby-identifier">strftime</span>(<span class="ruby-ivar">@shift_period_suffix</span>)
  <span class="ruby-identifier">age_file</span> = <span class="ruby-node">&quot;#{@filename}.#{suffix}&quot;</span>
  <span class="ruby-keyword">if</span> <span class="ruby-constant">FileTest</span>.<span class="ruby-identifier">exist?</span>(<span class="ruby-identifier">age_file</span>)
    <span class="ruby-comment"># try to avoid filename crash caused by Timestamp change.</span>
    <span class="ruby-identifier">idx</span> = <span class="ruby-value">0</span>
    <span class="ruby-comment"># .99 can be overridden; avoid too much file search with &#39;loop do&#39;</span>
    <span class="ruby-keyword">while</span> <span class="ruby-identifier">idx</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">100</span>
      <span class="ruby-identifier">idx</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span>
      <span class="ruby-identifier">age_file</span> = <span class="ruby-node">&quot;#{@filename}.#{suffix}.#{idx}&quot;</span>
      <span class="ruby-keyword">break</span> <span class="ruby-keyword">unless</span> <span class="ruby-constant">FileTest</span>.<span class="ruby-identifier">exist?</span>(<span class="ruby-identifier">age_file</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-ivar">@dev</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-constant">File</span>.<span class="ruby-identifier">rename</span>(<span class="ruby-node">&quot;#{@filename}&quot;</span>, <span class="ruby-identifier">age_file</span>)
  <span class="ruby-ivar">@dev</span> = <span class="ruby-identifier">create_logfile</span>(<span class="ruby-ivar">@filename</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">true</span>
<span class="ruby-keyword">end</span></pre>
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